<template>
    <div>           
        <!-- 
            面包屑导航区
            注意：
                下方面包屑导航不能跳转到 /users 可能的原因是此时导航本身就已经是 /users
        -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品列表</el-breadcrumb-item>
        </el-breadcrumb>


        <!-- 卡片区 -->
        <el-card class="box-card">
            <el-row :gutter="20">
                <el-col :span="8">
                    <el-input placeholder="请输入内容" v-model.trim="queryInfo.query" clearable @clear="getGoodsList">
                        <el-button slot="append" icon="el-icon-search" @click="getGoodsList"></el-button>
                    </el-input>
                </el-col>
                
                <el-col :span="4">
                    <el-button type="primary" @click="goAddpage">添加商品</el-button>
                </el-col>
            </el-row>

            <!-- table 表格区 -->
            <el-table :data="goodslist" border stripe>
                <el-table-column type="index"></el-table-column>    
                <el-table-column label="商品名称" prop="goods_name"></el-table-column>                    
                <el-table-column label="商品价格(元)" prop="goods_price"></el-table-column>                    
                <el-table-column label="商品重量" prop="goods_weight"></el-table-column>                    
                <el-table-column label="创建时间" prop="add_time">
                    <template slot-scope="scope">
                        {{ scope.row.add_time | dateFormat }}
                    </template>
                </el-table-column>                      
                                
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini"></el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini"></el-button>
                    </template>
                </el-table-column>
            </el-table>    
            
            <!-- 分页区 -->
            <el-pagination
                @size-change="handleSizeChange"
                @current-change="handleCurrentChange"
                :current-page="queryInfo.pagenum"
                :page-size="queryInfo.pagesize"
                :page-sizes="[5, 10, 15, 20]"                
                layout="total, sizes, prev, pager, next, jumper"
                :total="total">
            </el-pagination>
        </el-card>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 查询参数，商品列表配置参数
            queryInfo: {
                query: '',      //理解为查询条件
                pagenum: 1,
                pagesize: 10,                
            },

            // 接受请求到的商品列表数据
            goodslist: [],
            // 设置分页的总页数
            total: 0,
        }
    },


    created() {        
        this.getGoodsList()
    },


    methods: {
        // API 请求：根据分页获取对应的商品列表
        async getGoodsList() {
            const { data: res } = await this.$http.get('goods', {
                params: this.queryInfo
            })

            if (res.meta.status !== 200) {
                return this.$message.error('获取失败')
            }

            this.goodslist = res.data.goods
            this.total = res.data.total
            this.queryInfo.query = this.queryInfo.query.trim()
            console.log('获取商品',res);  // ceshi
        },


        // 分页个数发生改变触发
        handleSizeChange(newSize) {
            this.queryInfo.pagesize = newSize
            this.getGoodsList()
        },
        // 页码值改变触发
        handleCurrentChange(newPage) {
            this.queryInfo.pagenum = newPage
            this.getGoodsList()
        },

        // 跳转到添加商品的组件页
        goAddpage() {
            // 触发函数后直接进行‘路由跳转’
            this.$router.push('/goods/add')
        }
    },
}
</script>

<style lang="less" scoped>
</style>